Aura\Filter\Rule\Sanitize\Double::__invoke()

Complexity

Conditions	6
Paths	7

Size

Total Lines	59
Code Lines	26

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	26
CRAP Score	6

Importance

Changes

0

<?php
    public function __invoke($subject, $field)
    {
        $value = $subject->$field;

        if (is_float($value)) {
            // already a float, nothing to do
            return true;
        }

        if (is_numeric($value)) {
            // numeric string, cast to a float
            $subject->$field = (float) $value;
            return true;
        }

        if (! is_string($value)) {
            // not a string, cannot sanitize
            return false;
        }

        // it's a non-numeric string, attempt to extract a float from it.
        // remove all + signs; any - sign takes precedence because ...
        //     0 + -1 = -1
        //     0 - +1 = -1
        // ... at least it seems that way to me now.
        $value = str_replace('+', '', $value);

        // reduce multiple decimals and minuses
        $value = preg_replace('/[\.-]{2,}/', '.', $value);

        // remove all decimals without a digit or minus next to them
        $value = preg_replace('/([^0-9-]\.[^0-9])/', '', $value);

        // remove all chars except digit, decimal, and minus
        $value = preg_replace('/[^0-9\.-]/', '', $value);

        // remove all trailing decimals and minuses
        $value = rtrim($value, '.-');

        // remove all minuses not at the front
        $is_negative = ($value[0] == '-');
        $value = str_replace('-', '', $value);
        if ($is_negative) {
            $value = '-' . $value;
        }

        // remove all decimals but the first
        $pos = strpos($value, '.');
        $value = str_replace('.', '', $value);
        if ($pos !== false) {
            $value = substr($value, 0, $pos)
                   . '.'
                   . substr($value, $pos);
        }

        // done
        $subject->$field = (float) $value;
        return true;
    }
}